finnb I couldn’t find a contact email or abuse form. The nature of the attack is SYN flood and/or ACK + PSH flood, and the IP is 194.230.145.XXX (I can provide the full IP to an admin).
Daniele_Sunrise finnb Welcome to the community! Please contact our Abuse colleagues (abuse@sunrise.net) for more information. Greetings Daniele
pato finnb For all European addresses, you can use this site: https://apps.db.ripe.net/db-web-ui/query?searchtext=194.230.145.1 Then you select the tech-c and there you should usually find an abuse contact. This also works for all other continents, but the URL is different.